文摘
Objectives To test whether parameters derived from intravoxel incoherent motion (IVIM) can be used to distinguish lung cancer from obstructive pulmonary consolidation by comparing them with dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI)-derived parameters and to evaluate the correlation between these quantitative parameters. Methods A total of 31 lung cancer patients, confirmed by pathology and obstructive consolidations confirmed by positron emission tomography/computed tomography (PET-CT), were recruited. All of them were assessed with structural MRI and IVIM and 17 of them underwent additional DCE-MRI examinations. Parameters derived from IVIM and DCE-MRI in the tumour and consolidation were analysed, and the optimal cut-off values in differential diagnosis were obtained. Results ADCtotal, D and f values were lower (P--.05), while IAUC60 was higher in lung cancers (P--.013) compared with obstructive pulmonary consolidations. According to the ROC curve, ADCtotal outperformed other perfusion and diffusion parameters with the optimal cut-off value of 1.409?×-0-3?mm2/s (AUC--.95). Poor correlations were found between parameters derived from IVIM and DCE-MRI. Conclusions IVIM-MRI is potentially useful in the differentiation of lung cancer and obstructive pulmonary consolidation. ADCtotal, D and f may be reliable independent discriminating markers, but D * is variable with low diagnostic accuracy. Key Points -Lung cancer and consolidation differentiation is essential for treatment decision-making. -Perfusion and diffusion characteristics of lesions could help differential diagnosis. -IVIM can separate reflection of tissue diffusivity and microcapillary perfusion. -The relationship between perfusion quantified by IVIM and DCE-MRI is controversial.